# Skywalk PT1

Skywalk PT1 is designed to accept ERC1155 conditional token prediction market positions. This represents the predominant design of EVM-based prediction markets. The minting and redemption interfaces are entirely self-contained within the EVM versions of PT1.

### Reference Contract

Polygon: `0xB1dbf169e5091927E0618176C4cB272C9E0c1c34`

### Factory

As a security measure, Skywalk will only recognize alternative tokens deployed through the factory smart contract.

Polygon: `0x9CcCA3D8cCbeEEd856C072C115bcE49a29145355`

### Skywalk Router

The router contract consolidates approvals to make minting multiple prediction tokens easier. It is not compatible with alternative tokens.

Polygon: `0xBB1346dFadde111C6DCa04fC328b9f25eCa8d5c1`

### Decimals

* EVM Chains: 18

### Schema

| Required Variable       | Usage                                                                                                                                                             |
| ----------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `SKYWALK_REGISTRY_ADDR` | Skywalk Registry Address. Alternative tokens can use the 0 address                                                                                                |
| `MARKET_ID`             | Skywalk Market ID. Alternative token issuers can request their own ID block                                                                                       |
| `SKYWALK_PT_EDITION`    | Skywalk Prediction Token Edition                                                                                                                                  |
| `OUTCOME_HASH`          | A hash of the `MARKET_ID`, External Condition Hash and the specific outcome/side (YES or NO)                                                                      |
| `PAIR_HASH`             | A hash of both outcome hashes for a particular condition                                                                                                          |
| `EXTERNAL_ERC1155_ID`   | The ID of the acceptable ERC1155 token from the underlying exchange. Each Prediction Token will only be mintable when depositing ERC1155 tokens matching this ID. |

| Optional Variable        | Usage                                                |
| ------------------------ | ---------------------------------------------------- |
| `SKYWALK_META_PAIR_HASH` | Skywalk Meta Pair Hash. Use 0 hash if not available. |
| `SKYWALK_META_PAIR_SIDE` | Skywalk Meta Pair Side. Use FALSE if not available.  |

Skywalk Meta Pair Hashes refer to matching prediction markets at different exchanges.

### Exchange-Specific Parameters

External Condition Hash:

* Polymarket:  `conditionId`  as defined by their Gamma API

### Ways to Mint

Skywalk PT1 has been designed to make it easy to accept ERC1155 tokens from users who hold it within a single-signer Gnosis SAFE along with more advanced users who manage these tokens directly.

| Mint Source         | Mint Destination    | Function to Call  |
| ------------------- | ------------------- | ----------------- |
| Gnosis SAFE         | Controlling Wallet  | `mintToSafeOwner` |
| Holding Wallet/SAFE | Holding Wallet/SAFE | `directMint`      |

### Ways to Redeem

Because Polymarket conditional tokens use 6 digits of decimal precision, any Prediction Token redemption amounts that cannot be converted to at least one-millionth of an ERC1155 will be considered dust and burnt.

Users may redeem tokens to the destination of their choosing by calling the `redeemForErc1155`  function.

### Burn Functionality

PT1 tokens retain their native ERC-20 `burn` functionality. This may be useful when the underlying positions expire at 0 value. Direct burns will trap an equivalent amount of the underlying tokens in the PT1 contract forever and do not affect the redemption rate.


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